Mourners of one of two NYPD officers who were shot and killed while sitting in their patrol car Saturday, will begin to gather at a Queens church Friday afternoon.

The visitation for Police Officer Rafael Ramos is scheduled to begin at the Christ Tabernacle Church in Glendale as early as 2 p.m., with visitors allowed through 9 p.m.

Ramos, 40, was one of two officers murdered on Dec. 20 by Ismaaiyl Brinsley, 28. Ramos sat in the driver seat of their patrol car next to partner Wenjian Liu when Brinsley came up from behind the car and fired four gunshots from the passenger side, killing both cops.

Ramos was on the force only two years before he was killed. He became an officer in 2012, after working previously as a school safety agent.